Drive Motor Control Module

The DMCM receives the BCM Prerelease Allowed signal and simultaneously the DMCM sends a challenge to the BCM via the serial data circuit upon seeing the vehicle transition from OFF to any other power mode. Both the DMCM and BCM perform a calculation on this challenge. If the calculated response from the BCM equals the calculation performed by the DMCM, vehicle operation will be allowed by the DMCM.